Radio receiving device



May l2, 1925.

W. LYTTON ING DEVICE RADIO RECEIV Filed F65. 13, 192,3 2 Sheets-Sheet lMay 12, 192s. 1,537,124

W. LYTTON RADIO RCEIVING DEVICE Filed Feb. 13, 192,5 2 Sheets-Sheet. 2

PW my 12', 1.925.

UNITED STATES wnm'nmmoinor cmcaco, more, AssieNon 'ro LYfrfroNmconron'rnn, or

. CHICAGO, lILLINOIS, A COBPBATION F ILLINOIS.

nemo anonime nnvrcn.

Applidn @led lebrnary I To nllwhomz't may concern:

Be itvknown that'I, Waxman Lrr'roN, a citizen of the United .States ofAmerica, and a reside `of Chicago, county of Cook and State of nois,have invented a new and 'useful Improvement in Radio Receiving De-Ivices, of which the followinglis a specificain. Y i y I V.o Thisinventionrelates to means for. receiving radio signals, ad moreespeciallyto the amplification *and detection of rad1ofre quency signalsby vacuum tubes and a crystal detector, and' further to theamplification of the detected signals by the same tubes.

The main objects of this invention are to provide an improvedconstruction and artube terchangeably.

' line a-aof Fig. 1.

ent of radio apparatus ada ted for ilexi ility in use, and es ecially toacilitate changing romcry'stal etector to three element vacuum tubeequipment and vice versa; to provide an ,improved form of crystal'mounting adapted to fit in an ordinary three element tube socket; toprovide an improved .circuit arrangement including a switchingdeviceadapted `to accommodate `the use of eitherm Aspecial crystalholder (hereinafter described), or an Ordinar-'y three element Anillustrative embodiment of this invention is shown by the accompanyingdrawin s2 in whichy igure 1 is a. front elevation of a crystal detectorunit mounted [in a socket adapted to receive three element vacuum tubesand crystal units such as herein referred to in- Fig. -2 is a plan ofthedevice shown in Fig. 1, 4with the glass dome in section-` on the Fig. 3is a vertical axial section on the line 3--3 of Fig. 2. l

Fig. 4 is a horizontal section on the line 4-4 of Fig. 3.

'Fig. 5 1s a s ecti'dnon lthe line 5-5 o ig. 6 shows a modied form ofdetector adapted for use inplaceol", or interchangeably with the member62 oi Figure, the

` view being in section similar to the corresponding part of Fig. 3. y

F 7 is a conventional circuit diagram l showing an interchangeablecrystaldetector` unit in place, and with thc switch set accordingly. l

Fig. 8 shows that part 'of the circuit of 1s, was. serial ma. 618,799.

, -1 (15.21.1.24l ATENT oFFlc-E.- .y

Fig. 7 which includes als message bis,

unit and change over switch, a 'threege ement tube being here shown inplace.

Fig. 9 also shows the same part of the circuit as Fig. 8, but ahead-phone is here connected in place of the inductance primary 45, thecondenser being omitted. A

Referring now to the drawin shows the vcircuit connections o gram theantenna 1 is connected in series with the indnctance primary'2 and thevariable condenser 3 to the ground 4.-. The inductan'ce 2 transfers theradiofrequency .ein4

ergy to the inductance secondary which is' 'tuned by the variablecondenser `6. This combination is connected to the grid 7 and 'to thenegative side S-of the adjacent lilament through a small stoppingcondenser 9;-

Grid 7 controls the flow of electrons between the hot filament 10 andthe late 7 of the vacuum tube 11. The plate is connected y I i mynpleX-radio receiving system. In this dia-l to the primary 12 of theradiofreluencyv transformer 13. The other side of primary f 12isconnected to the primary 14: of the audiofrequency transformer 15.Prima 14 is shunted by a small condenser 16 to a ow the radiore uencyenergy from the'lxigh-A voltage B attery 17 to pass the' primary plate24 oi vacuumtube 20. The plate 2 4 is i connected to the primary 25 ofthe'radiofreuency transformer 26. The otherside of t e primary winding25 is connected to the primary 27 of the audiofrequency transormer28..This primary 27 is shunted by a small fixed condenser 29 so as lto allowthe radiofrequcncy energy to come from the B battery 17 and pass saidwinding 27 .of 'transformer 28 andi through the primary windin 25 ofradio transformer 26 to the plate 2 The radiofrequcncy energy in theprimary 25 is inductively transferred to secondary 30 of radiofrequencytransformer 26. One side of secondary winding 30 is connected to grid 31of the third vacuum tube 32. The other side of primary wind-- theprimary winding 45 and '5a A which,

former 32' and henc@ plaie of 'mbe mmems the grid terminal the zmubequem? mnsormer 46e 'lim @tha 15er- G primary Winding is connaaef *to:the mim 0 the three-point switch QS. The hingenos o saaie?. switch isconnected tha Sacmi airy 3G of "she 1' oquency mnsfoimav Tha clystul decto 'feutes h@ radii mequsncy energy from the secondary wind ing Sand'zhus impresses on the trans:- fomer L6 an audofrequency signal. Thissignal is sansfemed fom primary 4&5 to se@ ondary 45'.' This secondaryis conmemad acloss the sma Stopping condense? above explane, isconnectec bsween'ths lamen, of ube l' 'che secsndary- Winding 5; Thisserves to connect an audofrequency signal besween the negave side 8 offfilament 1G and the grid 7. This auderequency Signal will opende tube iland an audio'requency current from the E baery 1'? Wil flow throunfn th@pi throw a .aN

of tube El, thusl ely l? through the primaay 38 of the audio- 32. Themldo'jrequency signal is trans- :emed from p'lmary 38 of zudomquencymsformer 3S) to the secondary 50 which is connected in series with abiasing C bat-- Lary 5l acossrihe grid 52 anf the negative Side,oflamfexy 53 of the power tue f. The mldol'requency signal on grid 52co11- ros the output of he B battery l? @rough tha ou speaker. The powerimbe- 54; is only used for imdiorequency.

The @amants 10, 225 33, `and 53 of he vacmm ubes 1L 20 32 and 52 areconnecaed .in parz-Me! fwh one another across the ,inge baey 5g.' Encase the czysm deecor unit Sis 110i t0 be used il: can be easy removedfrom socket ft2 a ufsa men; mnplifying tube 58 inserted in its placa a5in Fig. ln order hat 'hs :amplifying tube 5Sv may opera-ie properly h@Swich blade 48 will have to be swung imm Contact pointe? to contactpoint 5'4".

Spamming @1 vacuum tuba 58 is as faows: E'e-onary 36 05E the indiafrequenti? tran'ozmer 3?' s`counecte' be" tween the 5 and thenegatvesid@ mamant 69. The v/aratien in of this gid 59 will comm) 'theow of currentbetwe'n th@ plata Si and the amm 6P. This plaie uan: comesfrom the BW baery i7 through the pm'a'y Wimin i5 f the audorequencygansformer- 46. he operation of 'the .sai from this paint is :asdesarbed above.

Refemng to the, structure of' unit 3 and its socket i2 in which i?, imnercl'xangebly, the crysal 43 is Set. in casinfj 62 f cyndrica shapewhich is secured in a dup-shaped block 63, being; ockef in .the recess64;. Secured to theundecsde cfhbock 63, as by means of socer.J is :aezmnal rod 65.

Th@ faelerjwre 66 1s heldin adjustable r"- laton he crystal 43 by meanso'f a post 67 au which it is securecl by a screw 68,' and, akermnu 69 isconnected to the lows? en@ of pos G7.` y

The Mock 63, post 67 and te'fmnuls :md 69 are all heid in place by a,hard ssttingg material. or wm; 70 contained in a. Gy'ndrca' casing f'l,the. botom of which is close by ber Wa 72. The. block erchangeajbly byset-5crew 73.

CII

*bhe crysm is secured inspeotvely of Fig, .3, 11 this instance the wire66 extee into the loose particles instead of being merely neontaot withthe surface of the crystal esrepxesemed by 'the Wire 66 'of g, Si 1 ncees ii; ehoud, be deeired' tous@ e head phone in thie system' in paoeof' the 10nd;

-apeeker 55, a, phooe device 76 may be con neevfe .in ehe circuit esslown in Fi 9.

Hexofho head' phone tekes heplace o lthe ie omiteodf.

imfuotame pmary 45, and the condenser 52e may be noted that While Iprefer to use e, ooodenser 49 in connection with the member i5 ieisa-noia `neeeesex'y und may he omitted, oe in Fig S.

of the construction shown may he elteres ,or omitted without departing'from 'the spirit of the invention as de'med; by the oowng daim..

I claim: H In' a radio receiving system, the combnation of a fourteymnal socket adapted to ecee either an ordinary Vacuum tube or alCrystal detector intor'chengeebly,' a radiof'requncy transformer, anaudiofmuency trxmsformer, and a switch arranged to eoxx- Illect one sideof the mdiorequenoy second ery to one side of the eudiofzequeneyprimary, and the op @site sides of seid second ery 'and prmeiy seingconnected to appropriate. terminals of seid socket respectively.

Signed at Cheago this. 3rd dey of Februar'y 1923.

WALTER LYT'roN.

nown and desevibed, ,d

